Hammer mill



Sept. 3, 1935.

M. N. DRESSEL HAMMER MILL 4 Sheets-Sheet l Original F iled Oct. 22, 1932 Sept. 3, 1935. M. N. DRE SEL 2,013,378

HAMMER MILL Original Filed Oct. 22, 1932 4 sh e s sheet 2 Y I nven lor jvfl ra sse l Sept. 3, 1935.

M. N. DRESSEL HAMMER MILL Original Filed Oct. 22, 1952 4 heets sheet 5 4 4 4% 44 ff w J v 7/ a; 0 1: L L [Ty-n4- 5% 4% 7 9.? Q I .75 4 4 jg ooooooe Invenlor fl/rze A. firesael A Home y Sept. 3, 1935. v M. DRESSE-L HAMMER MILL "Original Filed Oct. 22, 1932 4 s t -s t 4 Inventor fler/e jyzressel By QM flllorney Patented Sept. 3, 1935 PATENT OFFICE HAMMER MILL Merle N. Dressel, Le Sueur, Minn.

Application October 2;, 1932, Serial No. 639,104 Renewed August 2, 1934 7 Claims.

This invention relates to an improved hammer mill for agitating and grinding granular material, especially grains, in a manner to pulverize and reduce the material to the requisite powderlike fineness. e

Briefly stated, the preferred embodiment of the invention is characterized by a casing having an internal material receptacle provided with pulverizing screens of the desired gauge, together with a rotary bladed beater or agitator located in said receptacle and especially constructed to act on and condition the material in a predetermined manner.

One point of novelty is predicated upon the specific construction and shape of the casing which, as a single unit, includes an upper cylindrical portion, alower fan housing, and an intervening conical receiver to trap and deliver the 20 sition.-

The essential feature of construction is found in the rotary bladed beater regarded as novel in that it embodies'a plurality of individually swingable grain crushing and pulverizi'ng blades,

' 25 believed to be superior due to their ability to prevent clogging and damage.

Other and more specific features and advantages will become more readily apparent from the following description and drawings.

In the drawings:

Figure 1 is a top plan view of the casing.

Figure 2 is a similar view with the hinged lids removed.

I Figure 3 is a horizontal section taken approximately on the plane of the line 3-3 of Figure 4. N

Figure 4 is a vertical sectional and elevational view, the section being approximately on the line 4-! of Figure 1.

Figure 5 is a fragmentary detail view. 7

Figure 6 is a similar detail view, the section being on the line 66 of Figure 3.

I Figure 7 is a horizontal sectionon the line 1-1 of Figure 4. I Figure-8 is a fragmentary detail of the bottom of the material receptacle.

Figure 9 is a detail view showing one of the hinged joints for mounting for the agitator blades.

Figure 10 is a plan view of one of the arcuate removablescreens.

Figure 11 is a perspective view of one of the agitator blades.

' Figure 12 is a top plan view of the agitator 55 hub.

refined product into the fan housing for dispo-' Figure 13 is an elevational view of the hub shown in Figure 12.

Figure 14 is a fragmentary plan view of a portion of the bladed agitator showing the swingable action of one of the blades. 5

The general assembly of parts may well be seen in Figure 4 wherein it will be observed that the part designated as the casing is generally denoted by the numeral l5. This is a. sheet metal structure whose lower portion is formed into a 10 circular fan housing l6 for the rotary suction fan ll. Incidently this housing includes a removable base plate |8 with a detachable central bearing I9. The upper portion of the casing distinguished by the numeral 20 is of general 15 cylindrical form and is joined to the fan housing through the medium of a conical receiver 2| into which the ground material gravitates, and from which it is cast into the fan housing. Attached to the periphery of the fan housing is a delivery duct 22 through which the material is elevated into a bin (not shown) or other depository.

- The top of the cylinder 20 is composed of three parts; namely, a central stationary cross piece or spider 23 and a pair of complemental covers or lids 24 and 25 secured by hinges 26 to the part 23. The numeral 21 merely designates a filler neck or opening through which the granular material is introduced into the internal receptacle 28.

This receptacle 28 comprises a bottom disk or plate 29 formed centrally with diametrically opposed imperf orate webs 30 as shown in Figure 5. On opposite sides of the webs and around its marginal portion this disk is provided with retaining channels 3| for the removable arcuate screens 32. These channels 3| extend up the ends of the webs 30, as shown in Figure 5. The screens are made removable so that they can be replaced by other screens. The screens are installed according to the particular mesh or proportions thereof depending on the fineness or consistency of the product desired. The screens I cooperate with the webs in forming an endless wall for the receptacle which is disposed in spaced concentric relation to the cylinder 20. Incidently, the numerals 33 designate spacing and supporting brackets. In addition, numerals 3| designate additional supports or braces.

The power delivery or drive shaft is distinguished by'the numeral 35 and receives its power from a motor or other prime mover and this shaft extends through a bearing 35 into the conical receiver 2| and is provided on its inner end with a beveled gear 31 in constant mesh with a 39 located within the area of the receptacle 28.

The hub is provided with circumferential vertically superposed flanges 45 to which spaced ears or lugs 46 on the inner end of the blades 41 are pivotaliy attached as indicated at the point 48.-

The agitator is sumciently large in scope to :ap-

proximately fill the receptacle 28 as illustrated in Figure 4 of the drawings. It is to be noted that the agitator blades 41 are freely pivoted and swing back and forth on their vertical axes '20 caused by the centrifugal motion imparted thereto as the shaft 39 is set into rotation.

In practice, the material to be ground is introduced into the receptacle 28 by way of the inlet 2I, the quantity being regulated according to the discretion of the operator. Obviously when the bladed agitator is set into rotation, it causes-the material to whirl forcibly against the screens. The continuous centrifugalswirling and pounding action developed by this centrifugal rotating i force serves to reduce the grains of material into particles susceptible of pass g through the apertures in the gaugin screen. The material, thus pulverized, escapes into the space between the wall of the receptacle and the cylinder and sravitates into the fan housing '6 by way of the conical receiver 2|. The suction action of the fan collects the pulverized material and elevates it through the duct 22 into the storage bin or other depository to which the duct 22 is'connected.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention after considering the description in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Minor changes in shape, S126,' 8Bd merit of details coming within the field of invention claimed may be resorted to in actual practice, if desired.

housing, a horizontally arranged receptacle inv the upper portion of said casing disposed in concentric spaced relation within said cylinder, said receptacle being provided with a screened marginal rim, and a bladed agitator keyed to the upper portion or said shaft and located in said receptacle and including a hub of considerable diameter and imperforate, said agitator acting particles of such material passing through the screen into the space between the receptacle and the cylinder and then by gravity through the hopper into the fan housing.

2, Ahammer mill of the class described comrearrangeto throw-the material against the screen and they prising a. casing including a cylinder provided with closing means, a fan housing, and a conical receiver connecting the cylinder with the fan housing, a delivery duct connected to said fan housing, a perpendicular driven shaft mounted for rotation in said'casing' and centrally located, said shaft extending down into said housing, a fan attached to said shaft and located in the fan housing, a receptacle mounted in said cylinder and including a disk-like bottom provided with diametrically opposed upstanding imperforate webs, and on opposite sides of said webs with retaining channels of segmental form, said channels extending from an end of one web to an end of the other web'and the ends of-said webs having the channels formed thereon forming rlghtangular extensions of the first mentioned channels, removable arcuate screem mounted in said retaining channels with the ends of the screens fitting in the channels at the ends of the webs, a bladed agitator mounted on that portion of the shaft located in said receptacle, the blades of said agitator being pi'voted for free swinging motion in the marine described. '1'

3. A hammer mill comprising a casing having its upper portion fashioned to provide a cylinder, the top of said cylinder being formed with hinged lids, one of said lids having a filler opening to permit introduction of the material, the intermediate portion of the casing being fashioned to provide a conical gravity receiver, and

. in saidretaining' channels with the ends of the screens fitting in the channels at the ends of the webs, said screens cooperating with said webs in forming an endless wall for the receptacle, said well being disposed in spaced relation to the 'cylinder, said casing being provided with bearings, a driven shaft mounted for rotation in said bearings, a drive shaft operatively connected with said driven shaft, a hub attached to that p01- tion of the shaft located in the, receptacle, and a plurality of radial blades pivotally attached to. the hub on vertical axes, said blades sweepin through a path inclose proximity to the inner surface of the wall of the receptacle.

4. A mill embodying a casing comprising. a base including a horizontally disposed cylindrical drum and an inverted truncated conical portion mounted thereabove, a plate above the concal portion, a vertical shaft journaled on the ase and passed upwardly through said plate, a" rotor above the plate carrying peripheral hammers, a screen surrounding the hammers and cooperable therewith to reduce material, said rotor turning with the shaft, a hinged cover provided with a feed opening to enclose thev rotor, a fan in the-drum on the lower end 01 said shaft, and means to drive the vertical shaft to rotate the rotor and fan, the reduced material passing through said screen in a outward direction and passing downthe inner,

side of the conical portion to' the fan.

5. A mill embodying a casing comprising a base including a horizontally disposed cylindrica'l drum and an inverted truncated conical portion mounted thereon, a plate on the top edge of the conical portion, a vertical shaft journaled on the base and passed upwardly through said plate, a rotor above theplate carrying peripheral hammers, an annular screen element on the plate surrounding the rotor and cooperating with the hammers to reducermaterial, said plate provided with an annular opening radially outwardly of and surrounding the screen, said rotor turning with the shaft, a. cover provided with a feed opening hinged to the casing to enclose the rotor; a, fan in the drum on the lower end of said shaft, and means todrive the vertical shaft to rotate the rotor and fan, said fan drawing the reduced material through the screen and annular opening over the conical inside surface 'of the casing into the fan drum. e

6. A mill having a fan housing enclosin a fan,

a casing above and on the housing, a horizontal stationary plate having an annular peripheral opening, said plate mounted on the casing, a, cover including a feed opening over the plate to form a reducing chamber, a rotor carrying hammers in said chamber, a vertical shaft in the casing for mounting and driving the rotor, and an annual screen element carried on the plate between theperiphery of the rotor and the annular peripheral opening.

7. A hammer mill embodying a casing, a vertical shaft therein, a fan housing below the casing, a horizontal fan in said housing driven by said shaft, a reducing chamber above the casing, and a rotor carrying reducing hammers in the chambenand also driven by said shaft, the casing between the chamber and housing being formed in the shape of an inverted truncated cone to direct reduced material into the center of the fan.

MERLE N. DRESSEL. 

